[PyMOL] Pymolhybrid Caver plugin error

Hello, This might be a naive question as I am new to PyMol. I recently installed MacPyMol and followed the instructions on Plugins - PyMOLWiki  to install the plugin Caver. After successfully installing Caver, I loaded  the trajectory I want to analyze to compute tunnels, I get the following mess

[PyMOL] Antwort: interface surface Area and distances in two dimeres (Ashwani Kumar)

Dear Ashwani Kumar To get the interface area between two molecular entities, you calculate the accessible surface of the complex and that of the separated entities, the difference between the two is twice the interface area. Any tool that allows you to calculate a solvent accessible surface are